Identify manual tranmission by look or casting numbers?

While wondering around the local salvage yard I came across a gutted out white Fiero stacked on top another car with a manual transmission hanging out of it. The option codes sheet from the left front fender is long gone and there's no VIN number. (dash is gone) It doesn't look the same as the Izuzu 5 spd in my 86(there's no dipstick) and I'm thinking it might be a Munsi or a Getrag. Does anyone have pics of the various transaxles or know how to identify them by the numbers stamped on the case? :confused: